EM4: Automotive EMC Technology at Karlsruher Institut Für Technologie | Flashcards & Summaries

Lernmaterialien für EM4: Automotive EMC Technology an der Karlsruher Institut für Technologie

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TESTE DEIN WISSEN

What are the two types of immunity

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TESTE DEIN WISSEN
  • Electromagnetic fields
  • Electrostatic discharge
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TESTE DEIN WISSEN

Name some strategies to eliminate electromagnetic influences

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TESTE DEIN WISSEN

- Minimize source amplitude

- Disconnect coupling path

- Maximize fault tolerance

Lösung ausblenden
TESTE DEIN WISSEN

Name some technologies to evaluate emission signals

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TESTE DEIN WISSEN

Peak detector

- Capacitor is being charged to the max value of the envelope curve + correction by a factor


Average detector

- Capacitor is charged to current value

- Low pass filter smoothes voltage (--> average value)

Lösung ausblenden
TESTE DEIN WISSEN

Whats the influence of the so called Curie temperature on inductors?

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TESTE DEIN WISSEN

Permeability suddenly decreases at temperatures between 100 - 350°C

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TESTE DEIN WISSEN

What are the two types of emissions

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TESTE DEIN WISSEN
  • Internal emission affecting other components in the vehicle - quality issue regulated by OEM
  • External emissions affecting the environment - regulated by law
Lösung ausblenden
TESTE DEIN WISSEN

Explain the effects of the Maxwell equations

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TESTE DEIN WISSEN
  • High frequency
    • Change in magnetic field induces an electrical field
    • Change in electrical field induces a magnetic field
  • Low frequency (geometry > 6 lambda)
    • No interaction between M and E field
    • E field dependent on voltage
    • M field dependent on current
Lösung ausblenden
TESTE DEIN WISSEN

Explain the Fourier transform and different bandwidths

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TESTE DEIN WISSEN
  • Fourier transform is from time to frequency range
  • Periodic signals are sum of distinct frequencies ➔ Narrowband
  • Pulses and irregular signals are sum of all frequencies in a range ➔ Wideband
  • The shorter a rise time the higher the frequencies occurring in the signal. 
Lösung ausblenden
TESTE DEIN WISSEN

What is the working principle of a test receiver

Lösung anzeigen
TESTE DEIN WISSEN

Sweep through all frequencies and always only measure a small frequency range using a band-pass filter. Changing of filter is not possible ➔ Multiply input with generated frequency to transform signal and calculate back to original value after measurement.

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TESTE DEIN WISSEN

When is a signal classified as broadband?

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TESTE DEIN WISSEN

>6 dB difference between Average and Peak value

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TESTE DEIN WISSEN

Explain the definition of EMC

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TESTE DEIN WISSEN

Electromagnetic Compatibility


„The ability of an equipment or system tofunction satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment“


Emission (legislation) - Immunity (OEM specification)

Lösung ausblenden
TESTE DEIN WISSEN

What is the complexity of EMC in a vehicle environment?

Lösung anzeigen
TESTE DEIN WISSEN
  • Immunity
    • Root cause analysis difficult due to networked system
  • Emission
    • Device under test must be isolated ➔ Rest bus simulation required
  • Optical link between DUT and measurement devices to prevent influences
  • New Operating modes in electric or hybrid vehicles that are hard to reproduce (boosting, recuperating, ...)
Lösung ausblenden
TESTE DEIN WISSEN

How can one shield against electromagnetic coupling effects?

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TESTE DEIN WISSEN

- Cable shielding with mesh wire, metal slide or metal tube (Copper or aluminium)

- Shielding of the housing (Metal)
- Material: Laminations or slides of galvanized steel, aluminium or copper


Lösung ausblenden
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Q:

What are the two types of immunity

A:
  • Electromagnetic fields
  • Electrostatic discharge
Q:

Name some strategies to eliminate electromagnetic influences

A:

- Minimize source amplitude

- Disconnect coupling path

- Maximize fault tolerance

Q:

Name some technologies to evaluate emission signals

A:

Peak detector

- Capacitor is being charged to the max value of the envelope curve + correction by a factor


Average detector

- Capacitor is charged to current value

- Low pass filter smoothes voltage (--> average value)

Q:

Whats the influence of the so called Curie temperature on inductors?

A:

Permeability suddenly decreases at temperatures between 100 - 350°C

Q:

What are the two types of emissions

A:
  • Internal emission affecting other components in the vehicle - quality issue regulated by OEM
  • External emissions affecting the environment - regulated by law
Mehr Karteikarten anzeigen
Q:

Explain the effects of the Maxwell equations

A:
  • High frequency
    • Change in magnetic field induces an electrical field
    • Change in electrical field induces a magnetic field
  • Low frequency (geometry > 6 lambda)
    • No interaction between M and E field
    • E field dependent on voltage
    • M field dependent on current
Q:

Explain the Fourier transform and different bandwidths

A:
  • Fourier transform is from time to frequency range
  • Periodic signals are sum of distinct frequencies ➔ Narrowband
  • Pulses and irregular signals are sum of all frequencies in a range ➔ Wideband
  • The shorter a rise time the higher the frequencies occurring in the signal. 
Q:

What is the working principle of a test receiver

A:

Sweep through all frequencies and always only measure a small frequency range using a band-pass filter. Changing of filter is not possible ➔ Multiply input with generated frequency to transform signal and calculate back to original value after measurement.

Q:

When is a signal classified as broadband?

A:

>6 dB difference between Average and Peak value

Q:

Explain the definition of EMC

A:

Electromagnetic Compatibility


„The ability of an equipment or system tofunction satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment“


Emission (legislation) - Immunity (OEM specification)

Q:

What is the complexity of EMC in a vehicle environment?

A:
  • Immunity
    • Root cause analysis difficult due to networked system
  • Emission
    • Device under test must be isolated ➔ Rest bus simulation required
  • Optical link between DUT and measurement devices to prevent influences
  • New Operating modes in electric or hybrid vehicles that are hard to reproduce (boosting, recuperating, ...)
Q:

How can one shield against electromagnetic coupling effects?

A:

- Cable shielding with mesh wire, metal slide or metal tube (Copper or aluminium)

- Shielding of the housing (Metal)
- Material: Laminations or slides of galvanized steel, aluminium or copper


EM4: Automotive EMC Technology

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